Tail water elevations in HydroCAd
Tail water elevations in HydroCAd
(OP)
If you have different variable tail water elevations corresponding to different storm events, can you use the same link node in HydroCAD? It seems like you should, as the elevation tab lets you select different events, however when as soon as I define a second event, it overwrites the first. For instance, I select 2-year event, define the tail water, and hit apply. Go to define a 100-year tail water. The 100-year has now overwritten the previously entered two year. Obviously the work around would be to create a link for each event, but it just seems that you can't use the same link node. Using HydroCAD 10.00-16. Thanks.





RE: Tail water elevations in HydroCAd
Your best solution is to model the tailwater point within HydroCAD using an appropriate reach or pond, so that you have the correct elevation vs. time for each event. Remember that the elevation is constantly varying throughout the storm, so entering a single (fixed) tailwater will rarely produce an accurate model.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Tail water elevations in HydroCAd
RE: Tail water elevations in HydroCAd
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Tail water elevations in HydroCAd
It appears this would be a great "wish list" item: the ability to have a different tailwater curve for each storm event in a single link.
RE: Tail water elevations in HydroCAd
RE: Tail water elevations in HydroCAd
However, I would advise caution when using a manual tailwater. For correct results, you need a complete table of elevation vs. time, and not just a fixed elevation. Using a fixed elevation (such as the maximum for each event) will generally cause the site discharge to be too low before and after the time of peak tailwater. A fixed tailwater is only appropriate when the receiving water body is stable during the entire duration of your model, otherwise you need to include the receiving body in your model in order to calculate an accurate tailwater elevation vs. time.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Tail water elevations in HydroCAd
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Tail water elevations in HydroCAd
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Tail water elevations in HydroCAd
RE: Tail water elevations in HydroCAd
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Tail water elevations in HydroCAd
Yes, I do the same as a work-around. It is just more cumbersome and can be prone to human error (forgetting to switch the routing), and, as you stated, can look peculiar in reports for reviewers.
RE: Tail water elevations in HydroCAd
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Tail water elevations in HydroCAd
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com